Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f249a8c8f85303d…

MALICIOUS

PDF

89.3 KB Created: 2021-07-29 17:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 986059ea3ea5f2ed283c8c1038e3aed4 SHA-1: ea44a66d3649baf1e89d510d00bc17852d5f8326 SHA-256: 6f249a8c8f85303d408bd1982e231642a0f09e61911d8b0f6b88a7ed8008841d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/uplcv?utm_term=where+my+water+2+duck+rush PDF link annotation
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160798a7c6c33f---87784419629.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/2qeeef5tg7nivjp69f7nfddfdk/dexizuneno.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/tijuje.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/11287899232.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b714ed8d4---raxilomitanegexek.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/8758a84cddc459b2bcbb509ba56e50a3/19260876703.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4817d285f---5324332996.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d4b5732c8---zebajene.pdfIn PDF document text
    • http://cci100.com/clients/57496/File/14488067524.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/wupuzedapajinemadasifape.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/mowome.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/84927510523.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ad9a0c50b37---25117356770.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/kawebofezugatisuvakifubi.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/0910s4mo32fhaf9ddq2g1ten80/guxoloxoraderitomad.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/e82366112a2f0cc12e8e6887337a0014/16817870290.pdfIn PDF document text
    • https://arendic.cl/files/jekuwiwufexijibakomaruxax.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/64555133190.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba781819040---69390392608.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b050357574f---motevanaru.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcb8481f01---94131383540.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105031943061817.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/dumoma.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c9a35938b---86644870045.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C8 17192 bytes
SHA-256: 246a184e13981b162b6050827bcab7709b66390cee4359a38b4ce626b708f796
font_02_sfnt_off00013ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECD 10776 bytes
SHA-256: 751faebf5848a64b71c190c2ee1f51d59cfeab85001547a89fd0f13f91224ab0

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